在之前的研究中，猴子们得到了第三种选择，使他们可以继续进行新的试验。
As in a previous study, the monkeys were given a third choice that would allow them to pass on to a new trial.
接下来，研究人员引入了第三种选择，用第三只桨启动一个新的试验，让海豚选择跳过困难的试验。
Next the researcher introduced a third option, a third paddle that would initiate a new trial, giving the dolphin the choice of passing on difficult trials.
还有第三种选择，一份中杯苏打水5.25美元。中杯也许对你来说是最完美的选择，但大杯只贵了四分之一。
There's a third option, a medium soda for $5.25. Medium may be the perfect amount of soda for you, but the large is only a quarter more.
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